Electrical signaling system



6. V. LOGWOOD ELECTRICAL SIGNALING SYSTEM April 13 1926.

Filed July 12, @1919 Patented Apr. 13, 1926.

UNITED STATES CHARLES VEYNE LOGWOOD, OF NEW YORK, N. Y.

announcer. srenemne sYs rEM.

ime... filed July 12, 1919. Serial at. 310,313.

To all whom it may concern:

Be it known that 1, CHARLES V. Loowoon, a citizen of the United States, res1d1ng at New York, in the county and State of New York, have made a certain new and useful.

Invention in Electrical Signaling Systems,

' of which the following is a specification.

This invention relates to electrical signaling systems, and is particularly adaptable for use in radio communications. I

The object of the invention is to provide a signaling system which is simple in circuital arrangement and efficient in operation.

A further object of the invention is to provide an efficient radio transmitting system.

A further object of the invention is to provide a novel and extremely eflicient and sensitive radio telephone system.

F urther obi'ects of the invention will appear more fu 1y hereinafter.

The invention consists substantially in the construction, combination, location and relative circuital arrangement of parts, all as will be more fully hereinafter set forth, as shown by the accompanying drawing, and finally pointed out in the appended claims. Referring to the drawing,the single figure shows 1n circuital arrangement a transmitting system embodying mv invention.

I have shown my invention as applied to an antenna earth system, such as 1s employed in radio communications, wherein 1 designates the antenna which is adjustably connected to the antenna inductance 2. The inductance 2 is provided with a plurality of tap connections 3 from difierent portions thereof, any one of which is connected by fan switch 4 through one or more condensers 5 to the ground or earth 30. If desired, and as shown, a hot wire ammeter 6 is inserted between the condensers 5 and the earth 30. The switch 4 is electrically con.- nected through a blocking condenser 7 tothe grid electrodes 31 and 32 of the audions 33 and 34, which electrodes are connected in series with a blockin condenser 9 inserted therebetween. The filament electrodes 35 and 36 of the respective audions 33'and 34 are likewise connected in series through a resistance 37 which is connected atits mid point to one terminal of the filament heating battery 38, the other terminal of which is connected to a variable resistance 39 and the filaments of the audions. This last traced circuit is also connected by the lead 40, to the antenna-earth circuit, and by a lead 41 to one section 42 of a two section iron core impedance coil, to the negative side of the B battery 43. The positive side of this battery 43 is connected to the second section '44 of the impedance coil, choke coil 45 for choking currents of radio frequencyand to one terminal of the kicking coil. The kicking coil is made up in two sections 46 and 47 and is provided with an iron core, and acts as a choke coil for radio frequenc current. The two sections of the kicking coil are so wound that their fields are in opposition to each other. The sec tions are each connected to the'plate electrodes 48 and 49 of the audions 33 and 34, which plate electrodes are connected in series with each other and to the inductance coil 2 of the antenna earth system. A microphone 50 is included in the circuit of the usual microphone battery 51 and by means of the transformer 52 is connected to the grid electrodes 31 and 32, the connection being effected on opposite sides of the condenser 9. The circuit connecting the grid electrodes 31, 32, to the switch 4 in the antenna earth system is connected by means of a high resistance 55 to the filament earth circuit 40. The resistance should be in the nature of about 60,000 ohms, and a Morse key indicated at 56 may, if desired, and as shown be connected in this circuit whereby when the Morse key is depressed to completev the circuit a grid leak path to ground is effected to permit a discharge of the charge .on the grid electrodes. The op eration of the system' thus described is as follows: Oscillations are set up in the circuit 1, 2, 3, 4, 5, 6, 7 31, 9, 35, 40, the high voltage from the i3 .battery flowing in the following manner, from the positive side of the source 43 through the section 44 of the impedance coil through radio frequency choke coil 45 and thence to the divided coil of the radio frequency choke coils 46, 47. As above stated the two windings 46 and 47 are wound 'so that the fields thereof are not subject to each other. It will be apparent that if one of the sections, say, 46, would suddenly become short circuited, a big rise in counter E. M. F. would occur in the other section 47 and vice versa, due to the fact that the coils are no longer in opposition to each other, therefore, to 7 phenomena a transformer with its secondary terminals is connected one to each grid electrode as shown. While the varying currents of the primary coil produce alternating currents of varying amplitude, when the microphone 50 is spoken into this influences one of the grid electrodes negatively, thereby stopping the current in one of the sections 46 or 47 while the other grid electrode becomes positive, thus causing a rise of current in the other section 46 or 47 and vice versa. I have discovered that the current drops in radiation and does not increase but slowly closing the primary of the talking coil produces the increase of radiation. The choke and impedance coils 45, 4A and 42 keep the oscillations of both high and low frequency out of the operating part of the circuit above described, thereby preventing interference therefrom. It will be observed in the arrangement shown that I have provided a leak path 55, 56, for only the grid 31 as I have -found by actual experimentation that this is suflicient inasmuch as the grid 32 secures communication to this leakage path around the secondary coil of the microphone transformer which has a low resistance. I have further found that when talking in the primary circuit as above described the influence of the grids control a big variation of current through the two coils 46 and 4:7 and efiect a very eflicient and sensitive voice control or other signal control system for transmitting stations allowing perfect modulation without distortion and of great strength suitable for exceedin ly long distance work.

Many modifications and changes in details will readily occur to those skilled in the art Without departing from the spirit and scope of my invention as defined in the claims, therefore what I claim as new and useful and of my own invention and desire to secure by Letters Patent is,-

1. In a signaling system, a radiatin systern, means for generating and supp ying oscillating current to said radiating system comprising an audion and its associated circuits, a source of direct current included in one of said circuits, an impedance coil formed in two parts each part being oppositely wound with respect to the otherand included in circuit with said source of power, and means controlled by the signal to be sent for blocking the current ow through a portion of said coil.

2. In a system of the character described, the combination with an audion having associated therewith a hot and a plurality of cold electrodes, a divided circuit including a source of current connecting said hot electrode with one of said cold electrodes, and means controlled by the signal to be sent and includin an impedance coil formed in two parts eac part being oppositely wound with respect to the other for causing the current in one division of said circuit to pass through the other division of said circuit.

3. In a transmitting system, a work circuit and means for generating and transmitting oscillations to said work circuit comprising two audions with their plate electrodes connected in parallel through impedance coils connected in series but inductively associated with each other so that 0pposite polarities are adjacent to each other, and circuits connecting the electrodes of said audion.

4. In a transmitting system, a work circuit and means for generating and transmitting oscillations to said work circuit comprising two audions with their plate electrodes connected in parallel through impedance coils connected in series but inductively associated with each other so that opposite polarities are adjacent to each other, circuits connecting the electrodes of said audion, and means for modulating the current generated by and in accordance with the signals to be sent.

5. In an oscillating audion transmitting system, a plurality of audions connected with their plate electrodes in parallel, a common circuit connecting said plate electrodes with the filament electrodes of said audions, including an impedance coil formed in two parts each part being wound oppositely with respect to the other and means for alternatel charging alternate grid electrodes positively and negatively.

'6. In an oscillating audion transmitting system, a plurality of audions connected with their plate electrodes in parallel, a commoncircuit connecting the plate electrodes with the filament electrodes of said audions,

including an impedance coil formed in two,

parts each part being wound oppositely with respect to the other and means controlled by the signals to be sent for alternately charging alternate grid electrode positively and negatively.

7. In an oscillation audion transmitting system, two audions with their plate electrodes connected in parallel a common sig naling device associated with the grid electrodes of both audions, a circuit connecting the grid electrodes with the filament electrodes of both audions, a common source of current supply for said plate electrodes, and an impedance coil formed in two parts inductively associated with each other, with opposite polarities adjacent to each other included 1n circuit with said source of curelectrically connected audions and their associated circuits, a source of current connected to the plate electrodes of said audions, an impedance coil interposed between the source of current and each plate electrode, the impedance coil of each plate electrode being wound in opposition to its adjacent impedance coil of the plate electrode of adjacent audions, a divided impedance coil with the divided portions thereof wound in opposition to each other, each division thereof interposed in circuit between the source of current and a plate electrode of one of said audions.

9. The combination with a plurality of electrically connected audions and their associated circuits, a source of current connected to the plate electrodes of said audions, an impedance coil interposed between the source of current and each plate electrode, the impedance coil of each plate electrode being woundi in opposition to its adjacent impedance coil of the plate electrode of adjacent audions, a divided impedance coil with the divided portions thereof wound in opposition to each other, each division thereof interposed in circuit between the source of current and a plate electrode of one of said audions, and a signaling device associated with the grid electrodes of said audions. j a

10. The combination with a plurality of electrically'connected audions and their associated circuits, a source ofcurrentconnected to the plate electrodes of said audions, an impedance coil interposed between the source of current and each plate electrode,

the impedance coil of each plate electrode being wound in opposition to 'its'adjacent im- 1919. pedance coil of the plate electrode of adjacent audions, and a telephone transmitter associated with the grid electrodes of said audions.

11. The combination with a plurality of electrically connected audions and their associated circuits, a source of current connected to the plate electrodes of said audions, an impedance coil interposed between the source of current and each plate electrode, the impedance coil of each plate electrode being wound in opposition to its adjacent impedance coil of'the late electrode of adjacent audions, a div ded impedance coil with the divided portions thereof wound in opposition to each other, each division thereof interposed in circuit between the source of current and a plate electrode of one of said audions, and a telephone transmitter associated with the grid electrodes of said audions.

12. In a transmitting system, a work circuit, and means for generating and transmitting oscillations to said work circuit comprising two audions with their plate electrodes.

connected in parallel through im edance coils connected in series with each ot er and inductively associated with each other, with opposite polarities adjacent to each other.

13. Ina transmittingsystem, a work circuit, and means for generating and transmittin'g oscillations to said work circuit comprising two audions with their plate electrodes connected in parallel through iron cored impedance coils connected in series with each other and inductively associated with each other, with opposite polarities adjacent to each other.

In testimony whereofI have hereunto set my hand on this 9th day of July A. D.,

CHARLES VEYNE LOGWOOD. 

